使用 Android IME 进行选择

Question

在我的输入法服务中，我试图选择当前光标位置之前的文本。以下是代码sn -p

InputConnection inputConnection = getCurrentInputConnection();
ExtractedText extractedText = inputConnection.getExtractedText(new ExtractedTextRequest(), 0);
inputConnection.setSelection(extractedText.selectionStart-1,extractedText.selectionEnd);

InputMethodManager inputMethodManager = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
inputMethodManager.updateSelection(null, extractedText.selectionStart-1,extractedText.selectionEnd, 0, 0);

这有一个非常不稳定的行为，有时它会选择，有时它只是将光标向后移动一步。

谁能指出我做错了什么？

补充：

由于这个问题已经有一段时间没有得到解答，我想提出一个替代问题。我一直在寻找一些选择文本的替代方法，并在黑客键盘上按 shift 然后按箭头键就可以了，但我无法复制该过程。我尝试将 d-pad 键向下和向上键事件与 meta_shift_on 标志一起发送。

但这不起作用...再次，我做错了什么？

Answer 1

我通过使用 shift+箭头键解决了这个问题。

1 --> I was requesting the "inputConnection" for each event. I have now started using just one instance of inputConnection which I request for on the hook "onBindInput" and use it for all.
2 --> Sending Meta_shift_on as a flag along with the dpad_left/right/whatever was not enough, Now I send a press down shift event, then dpad up-down, and then up shift event. following is the pseudo-code: 


private void moveSelection(int dpad_keyCode) {   
inputMethodService.sendDownKeyEvent(KeyEvent.KEYCODE_SHIFT_LEFT, 0);
inputMethodService.sendDownAndUpKeyEvent(dpad_keyCode, 0);
inputMethodService.sendUpKeyEvent(KeyEvent.KEYCODE_SHIFT_LEFT, 0);
}

仅此而已。

注意：此解决方案或多或少是一种 hack，我仍在寻找更好的解决方案，它还允许我切换选择的锚点。如果你知道的更好，请分享。

Answer 2

inputConnection.sendKeyEvent(new KeyEvent(KeyEvent.ACTION_DOWN, KeyEvent.KEYCODE_SHIFT_LEFT));
inputConnection.sendKeyEvent(new KeyEvent(KeyEvent.ACTION_DOWN, KeyEvent.KEYCODE_DPAD_));
inputConnection.sendKeyEvent(new KeyEvent(KeyEvent.ACTION_UP, KeyEvent.KEYCODE_SHIFKEYCODE_DPAD_T_LEFT));
inputConnection.sendKeyEvent(new KeyEvent(KeyEvent.ACTION_UP, KeyEvent.KEYCODE_SHIFT_LEFT));

Answer 3

IME 中选择的最佳解决方案

private void SelectionLeft() {
        ExtractedText extractedText = mLatinIme.getCurrentInputConnection().getExtractedText(new ExtractedTextRequest(), 0);
        if (extractedText == null || extractedText.text == null) return;

        int selectionStart = extractedText.selectionStart;
        int selectionEnd = extractedText.selectionEnd;


        mLatinIme.getCurrentInputConnection().setSelection(selectionStart, selectionEnd - 1);

    }

    private void SelectionRight() {
        ExtractedText extractedText = mLatinIme.getCurrentInputConnection().getExtractedText(new ExtractedTextRequest(), 0);
        if (extractedText == null || extractedText.text == null) return;

        int selectionStart = extractedText.selectionStart;
        int selectionEnd = extractedText.selectionEnd;

        mLatinIme.getCurrentInputConnection().setSelection(selectionStart, selectionEnd + 1);

    }